What is a vacuum pump?
A vacuum pump is a mechanical device designed to induce an erection by creating a vacuum that draws blood into the penis. It consists of a hollow plastic cylinder in which the penis is placed, a pump that draws air out of the cylinder to induce blood flow into the corpora within the penis. A rubber tension ring, or strong rubber band is placed around the base of the penis once an erection is attained and the cylinder is removed. The ring, of course, is intended to inhibit blood from flowing out of the penis once the corpora is filled and must be removed.
To create a high vacuum in a system it is necessary to move all of the molecules of gas out of the system. The molecules will move only if there is a pressure difference between the two regions of the space (see Figure 4). The low pressure region is the space with the smaller number of molecules, while the high pressure region is the space with the larger number of molecules. Any device which can induce a pressure difference between the two regions in the space is called a pump. The pump which creates the vacuum in the certain system is called a vacuum pump. Exercise: you need only a cup of beverage and a straw. Try to suck a drink by the straw and feel how do the mouth muscles move. When one sucks on a straw the mouth muscles create the region of low pressure, while atmospheric pressure on the surface of your beverage pushes it up the straw. Pumps operate on the same principles. Figure 4: Vacuum pump operation.
The German scientist Otto von Guericke was the first person to demonstrate the properties of vacuums in a practical way in the year 1663. In front of an interested yet skeptical crowd he joined two small copper hemispheres (i.e., 20 inches (51 cm) in diameter) in an enclosed space. Then he pumped the air out of that enclosure and rigged a team of eight horses together to attempt to separate the hemispheres. The horses could not pull them apart. Perhaps in a Ripley’s moment, he repeated the experiment that same year using a team of twenty-four horses harnessed together. These horses still could not separate the hemispheres, due to the vacuum that had been formed in the enclosure. Once air was allowed back into the container the spheres were easily moved apart. Thus the power of the vacuum was realized. The vacuum pump was originally invented to help chemists study the properties of gases and the newly discovered phenomenon called electricity. A vacuum was created by removing all the air
A pump which removes gas molecules from an enclosed volume so that a partial vacuum is left behind is known as a vacuum pump. It was invented by Otto von Guericke in 1650. Pumps can be classified into three types according to the technology used. These three types are the Positive displacement pump, Momentum transfer pump and the Entrapment pump. Momentum Transfer Pumps, which are also known as molecular pumps, use high speed jets of thick fluid or high speed rotating blades to propel the molecules in gaseous state out of the chamber. Entrapment pumps trap gases in a solid state. Positive displacement pumps are most efficient for vacuums that are low.
There is provided on a vehicle a vacuum pump which suppresses the propagation of vibrations to an external container without the use of a damper. The vacuum pump has an outer cylindrical portion, a rotor portion and a stator portion accommodated within the outer cylindrical portion. This is to define a transferring portion for gases sucked from an inlet port. There is a magnetic bearing for supporting the rotor portion with respect to the stator portion, a motor for rotating the rotor portion with respect to the stator portion, and a base for supporting the outer cylindrical portion and the stator portion. The vibration absorbing member is interposed between the stator portion and the base, which has a natural frequency (F=(f1+f3)/2±(f1-f3)/4), provided that f1, f2 and f3 respectively denote a natural frequency of nutation in conical mode. A natural frequency in parallel mode and a natural frequency of procession in the conical mode, when the rotor portion is rotated at a rated speed.
